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  • Description: Type 2 AC surge protector - 3-phase+N
  • Standards compliance: IEC 61643-11 / EN 61643-11 / UL1449 ed.5
  • Certification: CSA /EAC/UL
  • Technology: MOV + GSG
  • SPD configuration: 3-phase+Neutral
  • Remote signaling of disconnection: option DS44S-400/G : output on changeover contact
  • SPD type : 2
  • Network: 230/400 V 3-phase+N
  • AC system: TT-TNS
  • Max. AC operating voltage : 440 Vac
  • Residual Current : < 2 mA
  • Max. discharge current : 40 kA/pole
  • Total Maximum discharge current : 40 kA
  • Admissible short-circuit current: 25 000 A

The DS40 surge protectors are designed to be used in a multipolar configuration to protect single-phase, 3-phase or 3-phase+neutral AC networks, are used mainly for primary protection at the main electrical panel. They are sometimes associated with dedicated N/PE surge protector based on gas tube technology (DS40G).
2 possible configurations :
Common mode : CT1 configuration

  • DS40 surge protectors are connected between line(s), Neutral and protective wire (PE).


DS42-280 single-phase (L+N) protect 

DS44-400 3-phase+N protect

DS44-230 3-phase+N protect

Common and Differential mode : CT2 configuration

  • DS40 surge protectors are connected between line(s) and Neutral to provide differential mode protection. A specific surge protector DS40G is connected between Neutral and Protective wire (PE) for common mode protection. This configuration provides the highest efficiency


DS44-400/G 3-phase+N protect

The DS40 impulse discharge capability classifies this SPD as regular Type 2, useful in case of medium lightning density areas. IEC60364 standard requests Type 2 SPD at the entrance of installation if the keraunic level Nk > 25.

This SPD is based on high energy varistor equipped with thermal disconnector and failure indicator, to comply with standards. Version with a remote signaling for disconnection indication is also available (DS4*S).
The DS40 is available for a large range of AC voltages. The DS40 is DIN rail compatible and is built with a plug-in module (DSM40-xxx) and a fixed base, which allows an easy and fast maintenance.


  • SPD type: 2
  • Network: 230/400 V 3-phase+N
  • AC system: TT-TNS
  • Nominal line voltage Un: 400 Vac
  • Max. AC operating voltage Uc: 440 Vac
  • Temporary Over Voltage (TOV) Charasteristics - 5 sec UT: 580 Vac withstand
  • Temporary Over Voltage (TOV) Charasteristics - 120 mn UT: 770 Vac disconnection
  • Residual Current Ipe: < 2 mA
  • Operating current Ic: 0.5 mA
  • Follow current If: None
  • Nominal discharge current In: 20 kA
  • Max. discharge current Imax by pole: 40 kA
  • Total Maximum discharge current Imax Total: 40 kA
  • Connection mode(s): L/N and N/PE
  • Protection mode(s): Differential mode 
  • Residuel voltage at 5 kA Up-5kA: 1.3 kV
  • Protection level L-N Up L-N: 1.8 kV
  • Protection level N-PE Up N-PE: 1.5 kV
  • Residual voltage at 10 kA Up-10kA: 1.5 kV
  • Admissible short-circuit current Isccr: 25 000 A  


  • Technology: MOV + GSG
  • SPD configuration: 3-phase+Neutral
  • Connection to Network: By screw terminals: 2.5-25mm² / by bus
  • Format: Plug-in modular box
  • Mounting: Symmetrical rail 35 mm (EN 60715)
  • Housing material: Thermoplastic UL94 V-0
  • Operating temperature Tu: -40/+85°C
  • Protection rating: IP20
  • Failsafe mode: Disconnection from AC network
  • Disconnection indicator: 1 mechanical indicator by pole
  • Remote signaling of disconnection: option DS44S-400/G: output on changeover contact


  • Standards compliance: IEC 61643-11 / EN 61643-11 / UL1449 
  • Certification: UL / CSA /EAC 


  • Thermal disconnector: Internal
  • Installation ground fault breaker: Type S or delayed
  • Fuses: Fuses Type gG - 50 A


DS44-400/G Type 2 AC surge protector - 3-phase+N are connected in parallel on the AC network and must be equipped with external fuses for short-circuit current protection

  • The total length of parallel connection wires to AC network must be lower than 0.5 m in order not to increase the protection level (Up) provided by the SPD.
  • Wiring is made by screw connections. On some models, a distribution bus can be used.
  • The protection wire coming from the SPD must be connected to the bonding bar of the electrical panel. Paralleling the protection wire with phases conductors must be avoided.
  • The cross sectional wire must be 6 mm² minimum for Type 2 SPD and 16 mm² for Type 1.
  • Local earthing resistance must be in compliance with the electrical rules.

Further information can be found in IEC 61643-12 standard (selection and application principles for low voltage SPD).





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